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C tesseract
(feddit.de)
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Oh, I guess I was confused by your wording then. You said there's no C flat or B sharp, but there definitely are both of those things. You also said there's no half step between them, but B to C is a half step. I guess you meant there's no note between B and C that represents a half step up from B or a half step down from C, but it wasn't clear to me.
B sharp is H right (please don't hate me) ๐ตโ๐ซ